<template>
    <div class="nav-bar" :class="isFixed ? 'is_fixed' : ''">
        <div class="container">
            <div class="pro-title">
                {{title}}
            </div>
            <div class="pro-param">
                <a href="javascript:;">概述</a><span>|</span>
                <a href="javascript:;">参数</a><span>|</span>
                <a href="javascript:;">用户评价</a>
                <slot name="buy"></slot>
            </div>
        </div>
    </div>
</template>

<script>
export default {
    name: 'product-param',
    props: {
        title: String
    },
    data() {
        return {
            isFixed: false,
        };
    },

    mounted() {
        window.addEventListener('scroll', this.initHeight)
    },

    methods: {
        initHeight() {
            let scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop
            this.isFixed = scrollTop > 152 ? true : false
        }
    },
    destroyed() {
        window.removeEventListener('scroll', this.initHeight, false)
    }
};
</script>

<style lang="scss" scoped>
@import '../assets/scss/config.scss';
@import '../assets/scss/mixin.scss';
    .nav-bar {
        height: 70px;
        line-height: 70px;
        border-top: 1px solid $colorH;
        background-color: $colorG;
        z-index: 10;
        &.is_fixed {
            position: fixed;
            top: 0;
            width: 100%;
            box-shadow: 0 5px 5px $colorE;
        }
        .container {
            @include flex();
            .pro-title {
                font-size: $fontH;
                color: $colorB;
                font-weight: bold;

            }
            .pro-param {
                font-size: $fontJ;
                a {
                    color: $colorC;
                }
                span {
                    margin: 0 10px;
                }

            }
        }
    }
</style>